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Zoology (Jena, Germany)2013; 117(3); 163-170; doi: 10.1016/j.zool.2013.10.004

Motion camouflage induced by zebra stripes.

Abstract: The functional significance of the zebra coat stripe pattern is one of the oldest questions in evolutionary biology, having troubled scientists ever since Charles Darwin and Alfred Russel Wallace first disagreed on the subject. While different theories have been put forward to address this question, the idea that the stripes act to confuse or 'dazzle' observers remains one of the most plausible. However, the specific mechanisms by which this may operate have not been investigated in detail. In this paper, we investigate how motion of the zebra's high contrast stripes creates visual effects that may act as a form of motion camouflage. We simulated a biologically motivated motion detection algorithm to analyse motion signals generated by different areas on a zebra's body during displacements of their retinal images. Our simulations demonstrate that the motion signals that these coat patterns generate could be a highly misleading source of information. We suggest that the observer's visual system is flooded with erroneous motion signals that correspond to two well-known visual illusions: (i) the wagon-wheel effect (perceived motion inversion due to spatiotemporal aliasing); and (ii) the barber-pole illusion (misperceived direction of motion due to the aperture effect), and predict that these two illusory effects act together to confuse biting insects approaching from the air, or possibly mammalian predators during the hunt, particularly when two or more zebras are observed moving together as a herd.
Copyright © 2013 Elsevier GmbH. All rights reserved.
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Publication Date: 2013-12-04 PubMed ID: 24368147DOI: 10.1016/j.zool.2013.10.004Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't
  • Research Support
  • U.S. Gov't
  • Non-P.H.S.

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research paper investigates the unique pattern of zebra stripes and offers a theory that the pattern’s blurring motion serves a camouflage purpose, confusing predators and biting insects by inducing visual illusions.

Background

The study sheds light on the ongoing debate in the realm of evolutionary biology concerning the purpose of the zebra’s striped coat pattern. This [the zebra’s striping] is a topic of interest that has puzzled scientists since the time of Charles Darwin and Alfred Russel Wallace. Several theories have been posed, one of the most compelling being that the stripes serve to ‘dazzle’ or confuse onlookers or predators. This research delves into the mechanism behind this confusion tactic.

Motion Camouflage Through Stripes

  • The basis of the study was to scrutinize the effects caused by the movement of zebra’s distinct high contrast stripes, hypothesizing that these stripes could create a form of motion camouflage.
  • In order to test this idea, a motivated motion detection algorithm was simulated to analyze the motion signals produced by different parts of the zebra’s body as they move.
  • The simulation demonstrated that the motion signals generated by the animal’s stripe patterns could produce highly misleading visual information.

Visual Illusions

  • The research suggests that the stripes’ motion causes the observer’s visual system to be overloaded with erroneous motion signals.
  • These misleading signals mirror two known visual illusions. The first is the wagon-wheel effect, where motion appears to invert due to an anomaly called spatiotemporal aliasing. The second is the barber-pole illusion, where the direction of motion is misperceived due to something known as the aperture effect.
  • The study predicts that these illusions work in tandem to confuse any onlookers. This could be particularly effective against biting insects approaching from the air, or possible mammalian predators during a pursuit, especially when observing multiple zebras moving together as a group.

Cite This Article

APA
How MJ, Zanker JM. (2013). Motion camouflage induced by zebra stripes. Zoology (Jena), 117(3), 163-170. https://doi.org/10.1016/j.zool.2013.10.004

Publication

Zoology (Jena, Germany)
ISSN: 1873-2720
NlmUniqueID: 9435608
Country: Germany
Language: English
Volume: 117
Issue: 3
Pages: 163-170
PII: S0944-2006(13)00097-4

Researcher Affiliations

How, Martin J
  • Queensland Brain Institute, University of Queensland, St Lucia, QLD 4000, Australia. Electronic address: m.how@uq.edu.au.
Zanker, Johannes M
  • Department of Psychology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK.

MeSH Terms

  • Algorithms
  • Animals
  • Cats
  • Computer Simulation
  • Equidae / physiology
  • Horses / physiology
  • Insecta / physiology
  • Models, Biological
  • Motion Perception / physiology
  • Pigmentation / physiology
  • Visual Fields

Citations

This article has been cited 36 times.
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